Idle Problems

6758 Views 2 Replies 2 Participants Last post by 200TQ, Apr 5, 2005

200TQ

Discussion Starter · Mar 15, 2005

hey guys. i love my car but its giving me a few problems. when i stop for a stop light/sign etc., my idle becomes very unsteady, rising and dropping very fast,(between 1500 to 1700rpm). it does this every time i drive. usually at every stop. every once in a while, it will smooth out and drop to a slightly-higher-than-normal idle. i unplugged the idle control valve when it was running unsteady, and the idle dropped and stayed normal, even when i plugged it back in. this is a used valve. i replaced my old one b/c it was doing the same thing. should i get a new valve? or does someone now that its something different?

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urq20v

· #2 · Mar 16, 2005

Have you tried cleaning the ISV?Give it a good clean in a container of petrol and make sure all the gunk buildup is cleaned out and the rotating valve inside moves freely.
Air leaks could also be a problem.Injector seals,ruptured hoses etc.Check that the crankcase breather from the left side of the engine going to the rubber junction hose on top of the cam cover is not perished.These can look fine but in fact are like jelly.They invariable have a split in them when perished.Generally check all vacuum/boost hoses for splits.

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